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SCSI errors: hardware or software?

I get errors in my syslog like these every night when I do backups, but
not otherwise.

  scsi : aborting command due to timeout : pid 70330894, scsi0, channel 0, id 6, lun 0 Read (10) 00 00 a7 ad 88 00 00 08 00 
  sym53c8xx_abort: pid=70330894 serial_number=70330826 serial_number_at_timeout=70330826
  SCSI host 0 abort (pid 70330894) timed out - resetting
  SCSI bus is being reset for host 0 channel 0.
  sym53c8xx_reset: pid=70330894 reset_flags=2 serial_number=70330826 serial_number_at_timeout=70330826
  sym53c1010-33-0: restart (scsi reset).
  sym53c1010-33-0: handling phase mismatch from SCRIPTS.
  sym53c1010-33-0: Downloading SCSI SCRIPTS.
  sym53c1010-33-0-<6,*>: FAST-80 WIDE SCSI 160.0 MB/s (12.5 ns, offset 62)

Are they likely due to hardware or software? 

I've twice asked the maintainer of the sym53c8xx_2 driver (Gerard
Roudier <groudier free fr>) but he hasn't answered.


--- Vladimir

ASUS CUV4X-DLS motherboard: 2 x P3, 2 GB RAM, dual, on-board LSI Logic /
Symbios Logic (formerly NCR) 53c1010 Ultra3 SCSI controllers, on board
Intel EtherExpress PRO/100+ NIC, on board VIA Apollo MVP3/Pro133x AGP,
various SCSI and IDE disks, ATI Radeon 7000 video card

Vladimir G. Ivanovic                        http://leonora.org/~vladimir
2770 Cowper St.                                         vladimir acm org
Palo Alto, CA 94306-2447                                 +1 650 678 8014

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